Sidi wa sanadi Hazrat Moulana Mohammad Taqi Usmani sahib db has related to us the following statements of Sayyid-ut-taifa Hazrat Haji Imdadullah mohajir-Makki ra & Hakeemul Ummat ra many times;

People call for unity again and again.
But they do not unite.

Do we know: What are the fundamental ingredients to make unity?

They are humility (tawa’duh) and giving preference to others over one’s self (‘esar).

There can never be unity between two arrogant (mutakabir) individuals.
Also, it can never be imagined until one is willing to sacrifice his own benefit, be it physical like money, property and position or whimsical like fame, stature and public appeal.

Without these two essential components talking of unity is mere lips service and diplomacy to gain some quick benefit. And once this benefit is achieved the factions disunite to be mortal enemies again.

wa ma taufiqi ila billahe